1. The state of being active
   "his sphere of activity";
   - action, activeness
    
2. Any specific behaviour
   "they avoided all recreational activity"
    
3. An organic process that takes place in the body
   "respiratory activity";
   - bodily process, body process, bodily function
    
4. The trait of being active; moving or acting rapidly and energetically
   "the level of activity declines with age";
   - activeness
    
5. A process existing in or produced by nature (rather than by the intent of human beings)
   "volcanic activity";
   - natural process, natural action, action
    
6. (chemistry) the capacity of a substance to take part in a chemical reaction
   "catalytic activity"

Derived forms: activities

See also: active, inactive

Type of: act, biological process, capability, capacity, deed, human action, human activity, organic process, physical process, process, state, trait

Antonym: inactivity

Encyclopedia: Activity